This is a fairly rare bootleg book of British origin that came out in 1971, according to David Huxley's Nasty Tales (a terrific book about British underground comics). There were a handful of British bootlegs produced in the first few years of the underground era that reprinted American comics without compensating the creators.

Jumpin' Jack Flash is one of those that compiled comics from several different sources. The cover of this book is taken from the splash page of Robert Crumb's story "Jumpin' Jack Flash" in Thrilling Murder Comics, one of his most notoriously violent and misogynist comics. It's followed by S. Clay Wilson's "Head First" one-pager from Zap Comics #2, which set a new standard of vulgarity when it came out in 1968. The bulk of Jumpin' Jack Flash is devoted to a "Trashman" story by Spain Rodriguez, taken from Subvert Comix #1.

It seems clear from the stories included in the book that Jumpin' Jack Flash was produced to appeal to the most libertine audience possible. But in doing everything possible to achieve that goal, the book naturally suffers from a lack of stylistic and thematic continuity. Ha, look at me, trying to critique a filthy old contraband book from across the Atlantic. Bloody hell, it's a fuckin' nasty bootleg from 40 years ago, 'nuff said. HISTORICAL FOOTNOTES:
It is currently unknown how many copies of this comic book were printed. It has not been reprinted.